Founding Engineer

⚡ Founding Engineer

Together with our CTO Stefan, you will be the #1 technical hire to ensure our product excels in live operations.

• Operate a reliable cloud infrastructure that enables 24/7 asset steering and high-frequency trading on short-term electricity markets
• Develop and improve the interfaces to the electricity markets and our steering box
• Expand our backtesting environment to test customer configurations, new algos and asset types
• Train, test, deploy and monitor electricity trading models

In your first quarter you will work towards:

• You build in a new asset type in our backtesting environment
• You design the cloud architecture for live operations
• You deeply understand our customers and the purpose of why we build Celsio

Profile

Must-have

• Strong CS / Math / Physics background, top university grad
• Shipped production code with experience in cloud infra (ideally AWS) and Python
• Owns workstreams end-to-end, delivers at quality, or flags early
• You build with purpose and understand what you are building for – electrifying the industrial base in Germany
• Fluent in English
• Based in Munich / willing to work on-site in Munich most of the time

Nice-to-have

• Optimization / data science (MILP, stochastic, RNN, RL)
• Fluent in German
• Time-series forecasting in production
• Energy / climate-tech knowledge

☝ We know the perfect profile does not exist. Don't worry if you don't have all of the above. Right mindset > right experience.

Why Celsio

⚡ We are building Celsio to power Europe's industry with clean and affordable heat.

We pair power-to-heat installations with cross-market electricity trading – buying power when it's cheap, selling flexibility when it's valuable.

🌍 One of Europe's largest unsolved climate problems. Your algos decide when factories switch from gas to electricity.

🧑‍🤝‍🧑 End-to-end ownership. No silos. You own the full engineering loop: design → prototype → ship → monitor. You will define key architecture decisions – Germany's industrials will run on your decisions.

⚡ Real markets, real stakes in €/MWh. Real and live electricity markets, with feedback on your algos every day.

🫶 Yours to shape. Team rituals, ways of working, weekly 1:1s with feedback both ways, what the office feels like – at this size you don't just join the culture, you build it.

💃 Backed to move fast. 7-digit funding closed, top-tier investors.

Comp + Perks

• Competitive base + equity
• Wellpass, regular team dinners, team sports, free snacks, fresh fruit & coffee in the office

Process

1. Screening call/coffee – 15 min with Stefan, get to know each other
2. Personal interview – motivation, fit, hard questions both ways
3. On-site in Munich – work a real case together (take-home or live coding + system design)
4. References – two calls with contacts you put us in touch with
5. Offer – we make it official

We give feedback after each stage, and decide within two weeks.

✉️ Interested? Send us an email at info@celsiotech.de with a short blurb on why you and why Celsio. Link your LinkedIn or attach your CV.

More info? Check out our Website (www.celsiotech.de) or our Hiring Landing Page.